Condensation boiler is actively used in all European countries. That this is a practical and reliable device, no one doubts. Europeans simply admire them - it is environmentally friendly equipment and significant energy savings. The first country that started using a condensing boiler was Holland. In the US, the use of such devices makes it possible to obtain preferential taxation conditions. In recent years, the technology of their production has become much cheaper, which allows them to pay attention to an increasing number of people. However, these units are twice as expensive as conventional ones, which is quite justified.
The condensing boiler works by a very simple principle. The creation of such devices became possible only after a corrosion-resistant light alloy of stainless steel appeared. This is due to the fact that during the formation of water condensation, corrosion of iron and steel occurred. Now you can talk about how the gas condensing boiler works. Water enters the unit, heating up there by the combustion of gas. After that, it leaves the boiler in the heating system, where it cools down. Then the water is again in the boiler. When the gas burns, not only heat is generated, but also various products of this process in the form of chemical compounds. Combustion of hydrocarbon fuel leads to the formation of water, carbon dioxide and nitrogen. The first component is converted to steam under the influence of high temperatures. Incomplete combustion of fuel leads to the formation of carbon monoxide and soot. These hot gases give their energy to the heat carrier, passing through the heat exchanger of the boiler, while heating the water. The cooled gases leave the atmosphere through the chimney. Water vapor leaves with smoke.
The condensing boiler is equipped with a secondary heat exchanger, which has a special design that allows the water to condense on a surface in which the temperature is less than 50 degrees Celsius. For the steam to settle, the heating medium of the return line of the heating system is used. A warm gas that was not used in the process of heating water in the main heat exchanger turns out to be in the second where the liquid flows after cooling. The vapors condense, giving off some of the energy, which allows the water to be heated. Formed condensate through the additional drainage pipe goes into the sewer.
Gas condensing wall boilers work the more efficiently the lower the temperature of the water entering the device. Optimum for such devices is a temperature of 30-40 degrees Celsius. In a radiator system, the temperature is usually 60-70 degrees, which leads to a decrease in the efficiency of such equipment, but it still remains quite high. The optimal operation of the condensing boiler is possible in the case when the difference in the temperature of the forward and reverse lines is at a level of 20 degrees, not more.